147 years old now in 2023 - what year born?

Today, 6 December 2023 if a person is 147 years old now, what year was he born? See below:

If 147 years old, year of birth is:
1875 or 1876*

*It depends on whether he was born before or after 1 January 1876.

If now 147 years and his year of birth 1875 if he was born after 6 December 1875 until 31 december 1875 inclusively, and his year of birth is 1876 if he was born from 1 January 1876 to 6 December 1876.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 16 years, year of birth 2006 or 2007
If now 28 years, year of birth 1994 or 1995
If now 79 years, year of birth 1943 or 1944

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